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Updated: Aug 19, 2026
A Non-invasive and Technically Non-intensive Method for Induction and Phenotyping of Experimental Bacterial Pneumonia in Mice
Published on: September 28, 2016
Water deprivation and food restriction on pulmonary bacterial defenses in mice
Abstract:
Mice deprived of water for 48 hr, mice allowed water but restricted in food intake to equal that consumed by the water-deprived mice, and control mice were exposed for 30 min to an aerosol of Serratia marcescens. Comparison of the number of organisms in the lungs of mice killed immediately after infection and those killed 4 hr later showed a normal reduction over the 4-hr period in the control mice. A significant increase, however, was observed in the water-deprived mice and an even greater increase in the food-restricted mice allowed water. The results did not correlate directly with the lung weight or lung water content. This reduction in bacterial defense could not be assigned solely to either water or food restriction.
Insights
Water and food restriction impair mouse lung bacterial defense against Serratia marcescens. Both conditions increased bacterial counts, with food restriction showing a greater effect, indicating complex nutritional impacts on immunity.
Area of Science:
- Immunology
- Microbiology
- Physiology
Background:
- Host defense mechanisms in the lungs are crucial for clearing inhaled pathogens.
- Nutritional status, including water and food intake, can significantly influence immune function.
- Understanding how physiological stressors affect innate immunity is vital for public health.
Purpose of the Study:
- To investigate the impact of water deprivation and food restriction on the lung's ability to clear Serratia marcescens.
- To determine if these nutritional deficits alter innate immune responses to bacterial infection.
- To differentiate the effects of water versus food restriction on pulmonary bacterial clearance.
Main Methods:
- Mice were subjected to 48-hour water deprivation or isocaloric food restriction.
- Experimental groups were exposed to Serratia marcescens aerosol.
- Bacterial load in lungs was quantified immediately and 4 hours post-infection.
- Lung weight and water content were measured.
Main Results:
- Control mice showed normal bacterial clearance over 4 hours.
- Water-deprived mice exhibited a significant increase in lung bacterial counts.
- Food-restricted mice (with water access) showed an even greater increase in bacterial load.
- No direct correlation was found between bacterial load and lung weight or water content.
Conclusions:
- Both water deprivation and food restriction impair pulmonary antibacterial defenses.
- Food restriction appears to have a more pronounced negative effect on bacterial clearance than water deprivation alone.
- The observed reduction in bacterial defense is not solely attributable to changes in lung hydration or weight.
